Missing VertexFormat unorm10_10_10_2 present in other implementations

[waywardmonkeys]

In gpuweb/gpuweb#4288, a new vertex format was added, but it doesn't seem to be in wgpu.

Is this an oversight, something planned, or intentionally omitted?

If given some pointers (or just an indication that it is desired), I might be able to try adding it myself.

[teoxoy]

We didn't get around to add it yet but it shouldn't be too hard. PRs welcome!

[kamalesh0406]

@waywardmonkeys are you working on a PR? If not, I can give it a try.

[waywardmonkeys]

I wasn’t yet, so feel free!